fix downloads dependencies

[tomwayson]

the downloads package uses dependencies instead of peerDependencies:

hub.js/packages/downloads/package.json

Lines 12 to 22 in 56c3539

	"dependencies": {
	"@esri/arcgis-rest-feature-layer": "^2.14.1",
	"@esri/arcgis-rest-portal": "^2.14.1",
	"@esri/arcgis-rest-request": "^2.14.1",
	"eventemitter3": "^4.0.4",
	"tslib": "^1.11.1"
	},
	"devDependencies": {
	"@esri/arcgis-rest-auth": "^2.14.1"
	},
	"files": [

Or don't fix this and just consolidate the fns into the content package and drop downloads #306